php-doc-en/reference/mysqli/functions/mysqli-fetch-field.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id="function.mysqli-fetch-field">
   <refnamediv>
    <refname>mysqli_fetch_field</refname>
    <refname>result->fetch_field</refname>
    <refpurpose>Returns the next field in the result set</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <para>Procedural style:</para>
    <methodsynopsis>
     <type>mixed</type><methodname>mysqli_fetch_field</methodname>
     <methodparam><type>object</type><parameter>result</parameter></methodparam>
    </methodsynopsis>
    <para>Object oriented style (method):</para>
    <classsynopsis>
     <ooclass><classname>result</classname></ooclass>
     <methodsynopsis>
      <type>mixed</type>
      <methodname>fetch_field</methodname>
      <methodparam><type>void</type><parameter></parameter></methodparam>
     </methodsynopsis>
    </classsynopsis>
    <para>
     The <function>mysqli_fetch_field</function> function is used to return the attributes
     of the next column in the result set represented by the <parameter>result</parameter>
     parameter as an object. When executed this function will return an object containing
     the attributes of the current column or &false; if there are no more columns in the
     result set.
    </para>
   </refsect1>
   <refsect1>
    <title>Return values</title>
    <para>
     Returns an object which contains field definition informations or &false; if no field information
     is available.
    </para>
    <para>
    <table>
     <title>Object attributes</title>
     <tgroup cols='2'>
      <thead>
       <row>
        <entry>Attribute</entry>
        <entry>Description</entry>
       </row>
      </thead>
      <tbody>
       <row>
        <entry>name</entry>
        <entry>The name of the column</entry>
       </row>
       <row>
        <entry>orgname</entry>
        <entry>Original column name if an alias was specified</entry>
       </row>
       <row>
        <entry>table</entry>
        <entry>The name of the table this field belongs to (if not calculated)</entry>
       </row>
       <row>
        <entry>orgtable</entry>
        <entry>Original table name if an alias was specified</entry>
       </row>
       <row>
        <entry>def</entry>
        <entry>The default value for this field, represented as a string</entry>
       </row>
       <row>       
        <entry>max_length</entry>
        <entry>The maximum width of the field for the result set.</entry>
       </row>
       <row>
        <entry>flags</entry>
        <entry>An integer representing the bit-flags for the field.</entry>
       </row>
       <row>
        <entry>type</entry>
        <entry>The data type used for this field</entry>
       </row>
       <row>
        <entry>decimals</entry>
        <entry>The number of decimals used (for integer fields)</entry>
       </row>
      </tbody>
     </tgroup>
    </table>
    </para>
   </refsect1>
   <refsect1>
    <title>See also</title>
    <para>
     <function>mysqli_num_fields</function>
     <function>mysqli_fetch_field_direct</function>
     <function>mysqli_fetch_fields</function>
     <function>mysqli_field_seek</function>
    </para>
   </refsect1>
   <refsect1>
    <title>Example</title>
    <para>
     <example>
      <title>Object oriented style</title>
      <programlisting role='php'>
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");

$mysqli->query( "DROP TABLE IF EXISTS friends"); 
$mysqli->query( "CREATE TABLE friends (id int, name varchar(20))"); 
 
$mysqli->query( "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

$result = $mysqli->query( "SELECT id, name FROM friends");

/* Get field information for all columns */
while ($finfo = $result->fetch_field()) {
    printf("Name:     %s\n", $finfo->name);
    printf("Table:    %s\n", $finfo->table);
    printf("Default:  %s\n", $finfo->def);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags:    %d\n", $finfo->flags);
    printf("Type:     %d\n", $finfo->type);
}
 
$result->close();

$mysqli->close();
?>
]]>
      </programlisting>
     </example>
     <example>
      <title>Procedural style</title>
      <programlisting role='php'>
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");

mysqli_query($link, "DROP TABLE IF EXISTS friends"); 
mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))"); 
 
mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

$result = mysqli_query($link, "SELECT id, name FROM friends");

/* Get field information for all columns */
while ($finfo = mysqli_fetch_field($result)) {
    printf("Name:     %s\n", $finfo->name);
    printf("Table:    %s\n", $finfo->table);
    printf("Default:  %s\n", $finfo->def);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags:    %d\n", $finfo->flags);
    printf("Type:     %d\n", $finfo->type);
}

mysqli_free_result($result);

mysqli_close($link);
?>
]]>
      </programlisting>
     </example>
    </para>
   </refsect1>
  </refentry>

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